MSDN recently rolled out new presentation choices for its Library content, which includes the MSDN online section for Silverlight:
If you haven't been there recently here's your obligatory handy link: Silverlight 3 on MSDN
The added presentation...

We just refreshed the online docs for Silverlight 3. In addition, the offline CHM has been updated. Most of the updates were just doc bug fixes. Right now writers are mostly focused on documenting Silverlight 4 Beta features (of course SL4 Beta hasn't...